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September 2006
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2006.09.26 12:50 "Re[2]: [Tiff] Status of ISO JBIG and CIELAB JPEG support", by Jean-yves Le Ridant
>> This lack of reference reader/writer/viewver is why I said to Joris >> about trying ICCLAB ( I understand that ITULAB is "great"). > Are these standards too new to be adequately documented? Are they controlled > by patent-enforcing companies which are aggressive litigators? No, the main problem is that it avoid the vaste of cycles, bandwidth, and storage space. Tell me about 3 x 128bits floating point RAW RGBA ! :-)) > I DID try to find some reference images as well as a complete specification, > but didn't find much at all. The spec is complete, without the least ambiguïty. Another problem ... I have link, somewhere, must just find it ... >> a "jpegintiff CIELAB affair" for any purpose other that what >> PhotoShop can do ( in turn save a monochrome file with a well >> defined calibrated L grayscale ) is basically ... hazardous. > I understand. It seems that the standard is too new and emergent to be very > useful outside a very limited scope. No, the problem is with and for the "old" CIELa*b* photometric. Somewhere, you'll need to use a jpeg codec in its "COLOR BLIND" mode, most of these are designed for unsigned 0 ... 2^N - 1 representations, and you can't assume what they do in range limiting at various points. Have a look to all the care of jpeglib about "CHAR" manipulations ... ;-) > I'm puzzled as to why it was embraced and adopted by the facsimile hardware vendors. cf above ... > Designing a "modern" facsimile > system without computer-based documents management and processing firmly in > mind seems mentally deranged. Hum ..., ça se discute. :-) -- Jean-Yves